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Attested
Found in inscriptions or medieval manuscripts.
Þurisaz is the third rune of the Elder Futhark and writes the "th" sound heard in "thin."
The Norwegian and Icelandic poems call this rune þurs, a giant, and say giants bring suffering to women. The Old English poem calls it þorn instead, a thorn that is sharp and painful to touch.
Reconstructed
Scholarly reconstruction from linguistic evidence.
The Proto-Germanic name is tentatively reconstructed as *þurisaz, "giant," from the Norse names. Because the English name differs, the reconstruction is marked as uncertain.
In practice today
How people use this rune now, in divination, magic, and devotion. Valid in its own right, and labeled modern so it isn’t mistaken for history.
In Ralph Blum's modern divination system, this rune (spelled Thurisaz) is read as a gateway.
Practice today: wyrd, galdr, and other old words people use when working with the runes now.